[vtkusers] How to decrease the poly data element

[Jérôme]

Hi Ali,

I read 78 DICOM files , and the result is a big vtkpolydata ,


The result of a DICOMImageReader is an vtkImageData. Can you precise when
occurs this error? Maybe by using a step-by-step debugging?
I think it is not the DICOMReader (78 slices, even with high plane
resolution, is not so much).
If the contour filter is generating the error, you can first try to
down-sample your image (vtkImageResample->SetAxisMagnificationFactor), or
crop it (vtkExtractVOI).
If you cannot trace step-by-step during runtime, call Update then PrintSelf
on your outputs (Reader, Contour and Normal filters) sequentially. this will
help in finding the real allocation problem.

Jerome




> which I can't
> apply any filter on it because it give the attached error ( it's a
> snapshot)
> even using Vtkshrinkpolydata , the used code is:
>        vtkRenderer *aRenderer = vtkRenderer::New();
>        vtkRenderWindow *renWin = vtkRenderWindow::New();
>        renWin->AddRenderer(aRenderer);
>        vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
>        iren->SetRenderWindow(renWin);
>
>
>        vtkDICOMImageReader *v16 = vtkDICOMImageReader::New();
>        v16->SetDirectoryName("C:\\1");
>        v16->SetDataOrigin(0, 0, 0);
>        v16->Update();
>
>        vtkContourFilter *skinExtractor = vtkContourFilter::New();
>        skinExtractor->SetInputConnection(v16->GetOutputPort());
>        skinExtractor->SetValue(0, 500);
>        vtkPolyDataNormals *skinNormals = vtkPolyDataNormals::New();
>        skinNormals->SetInputConnection(skinExtractor->GetOutputPort());
>        skinNormals->SetFeatureAngle(60.0);
>
>        /////////////////////Decrease the
> dataset/////////////////////////////////
>
>        vtkShrinkPolyData *shrink = vtkShrinkPolyData::New();
>        shrink->SetInputConnection(skinNormals->GetOutputPort());
>        shrink->SetShrinkFactor(0.90);
>
>        vtkPolyDataToTetrahedralGrid* gridder =
> vtkPolyDataToTetrahedralGrid::New();
>        gridder->SetInputConnection(shrink->GetOutputPort());
>
>
>        vtkDataSetMapper *skinMapper = vtkDataSetMapper::New();
>        skinMapper->SetInputConnection(gridder->GetOutputPort());
>
>        skinMapper->ScalarVisibilityOff();
>        vtkActor *skin = vtkActor::New();
>        skin->SetMapper(skinMapper);
>
>
>        vtkCamera *aCamera = vtkCamera::New();
>        aCamera->SetViewUp( 0, 0, -1);
>        aCamera->SetPosition( 0, 1, 0);
>        aCamera->SetFocalPoint( 0, 0, 0);
>        aCamera->ComputeViewPlaneNormal();
>
>        aRenderer->AddActor(skin);
>        aRenderer->SetActiveCamera(aCamera);
>        aRenderer->ResetCamera();
>        aCamera->Dolly(1.5);
>
>
>        renWin->SetSize(640, 480);
>
>        aRenderer->ResetCameraClippingRange();
>
>
>
>        iren->Initialize();
>
>    return 0;
> http://old.nabble.com/file/p26684126/error_screen.jpg error_screen.jpg
> --
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